We always have Christmas with my brothers and their families (family members differ year to year depending who's doing what etc) + my mother, everyone is either teenagers or adults so it's more of an adult Christmas.
Morning is fairly relaxed, we get up, do presents together, have a nice chocolate morning open wine. We're in the southern hemisphere so Christmas is summer which means after presents we chill on the deck listening to Christmas music eat more chocolate and chatting etc.
Have lunch at about 1pm-2pm, normally a roast along with vegetables and salads, we also do a BBQ (sausages, chicken wings, pork chops etc). Pudding is followed about an hour later, ice cream, chocolate mousse, fruit salad and there's always a pavlova.
I always take the teenagers for a swim at the local lake in the early evening and we might go for a walk or bike ride as well. Come back, eat more leftovers. Then we just chill for the rest of the evening, might do some karaoke, play pool, go through photos etc.
Starting the diet on the 1st January always features in my Christmas traditions 